If SRVO-037 (IMSTP Input) appears, try these immediate actions:
These steps can resolve temporary input signal interruptions.
FANUC Alarm SRVO-037 (IMSTP Input) occurs when the controller detects an abnormal or missing IMSTP input signal from the servo amplifier.
The IMSTP input is responsible for:
If the IMSTP input is lost or inconsistent, the robot stops to prevent unsafe motion.
SRVO-037 indicates that the controller is not receiving a valid IMSTP input signal from the amplifier.
Consequences include:
Faulty wiring is a primary cause.
Common issues include:
1. Broken or damaged IMSTP cables
2. Loose connectors
3. Shielding issues causing signal interference
Inspecting and securing cables restores stable input signals.
Connectors between the controller and servo amplifier can disrupt IMSTP signals.
Common issues include:
1. Oxidized or bent pins
2. Poorly seated connectors
3. Contaminated contact surfaces
Proper cleaning and reseating often resolves these issues.
The amplifier may fail to process the IMSTP input correctly.
Common issues include:
1. Internal circuit failure
2. Hardware degradation
3. Configuration or parameter errors affecting input recognition
External interference can corrupt the IMSTP signal.
The following components are commonly required when resolving SRVO-037 alarms:
Browse available FANUC spare parts at inrobots.shop for reliable replacements and fast global shipping.
A structured method used by experienced FANUC engineers to isolate SRVO-037 causes:
Swap IMSTP Cables Between Axes or Amplifiers
Interpret Results:
Why Cable Integrity Matters:
IMSTP cables transmit critical enable/disable signals from the servo amplifier to the controller. Faults such as:
…can easily trigger SRVO-037 alarms and interrupt safe robot operation.
Next Steps:
These alarms are closely related to servo input and communication issues.
FANUC Alarm SRVO-037 – IMSTP Input indicates a lost or inconsistent input signal to the servo amplifier.
By inspecting cables, connectors, and amplifiers, engineers can restore safe motion control and reliable robot operation.
Common causes include IMSTP cable faults, connector issues, or amplifier input failure.
Only if the issue is temporary. Persistent alarms require immediate troubleshooting.
Yes, as it affects safe start/stop control and axis motion.
Inspect cables, reseat connectors, and replace faulty amplifiers or motors as needed.
Explore the Full Guide: Industrial Robot Fault Codes Library → Fanuc Alarm Codes
Explore the complete guide for troubleshooting, repair strategies, and component replacement across industrial robot systems.
Key components commonly involved in fanuc alarm troubleshooting issues and replacements.
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